I have on my todo list to push the support of php71 to ns6. Because the first repository I used was a custom one of remi, I disabled it in yum. With the coming of php71 yum will complaint because it is not enabled.
You should do a yum upgrade on my repository (which is enabled by default) to upgrade the rpm nethserver-remi-phpscl, it will set the remi-safe repository and my upgrade will be silent...quiet I hope.
By the way a great man (daniel bertaud) gave me a good Idea, I'm working to set the settings of php directly by vhost, even if I use the php-fpm (one pool per vhost with a unix socket). For compatibility reason, I will let the support of php-fpm with tcp ports